/** A native Lark topic id used by client AppLinks. This is deliberately
 * distinct from Botmux's `om_...` root-message routing anchor. */
export declare function isNativeTopicId(value: unknown): value is string;
/** Fill an empty session field from an inbound topic event without ever moving
 * an existing session to a different topic. */
export declare function fillNativeTopicId(session: {
    larkThreadId?: string;
}, scope: 'thread' | 'chat', threadId: unknown): boolean;
//# sourceMappingURL=native-topic-id.d.ts.map